crème de la crème vs jet set

crème de la crème

noun
  • Best of the best; something superlative; the very best. 

jet set

verb
  • To follow the life style of the jet set. 

noun
  • A social class of wealthy people who travel for pleasure. 

adj
  • Relating to the life style of the jet set. 

How often have the words crème de la crème and jet set occurred in a corpus of books? (source: Google Ngram Viewer )